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Stihl Ht 75 Owners Manual

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    							1 HT 70, HT 75english
    Printing inks contain vegetable oils;
    paper can be recycled. Printed on chlorine-free paper. © ANDREAS STIHL AG & Co. KG, 2003 
    0458 390 3021. M7. D3. PM. Printed in USA 
    STIHlContentsGuide to Using this Manual  ..............  2
    Safety Precautions  ...........................  3
    Using the Pole Pruner  ....................  13
    Mounting the Bar and Chain  ...........  16
    Tensioning the Saw Chain  ..............  17
    Checking Chain Tension  .................  17
    Adjusting the Throttle 
    Cable* .............................................  17
    Fuel ................................................  18
    Fueling ............................................  19
    Chain Oil  .........................................  20
    Filling Chain Oil Tank  ......................  20
    Checking Chain Lubrication  ...........  21
    Adjusting Telescopic Shaft ..............  21
    Fitting the Harness  .........................  22
    Starting / Stopping 
    the Engine  ......................................  23
    Operating Instructions  ....................  27
    Taking Care of Guide Bar  ...............  28
    Cleaning the Air Filter  .....................  28
    Motor Management  ........................  29
    Adjusting the Carburetor  ................  29
    Spark Arresting Screen* in Muffler  .  31
    Checking the Spark Plug  ................  31
    Replacing the Starter Rope 
    and Rewind Spring  .........................  32
    * ........see “Guide to Using this Manual“Storing the Machine  .......................  35
    Checking the Chain Sprocket  .........  35
    Replacing Chain Sprocket  ..............  36
    Maintaining and Sharpening 
    Saw Chain  ......................................  36
    Maintenance Chart  .........................  41
    Parts and Controls  .........................  42
    Specifications .................................  44
    Special Accessories  .......................  45
    Maintenance and Repairs  ..............  45
    STIHL Incorporated Federal 
    and California Emission Control 
    Warranty Statement ........................  46Allow only persons who understand this 
    manual to operate your pole pruner. 
    To receive maximum performance and 
    satisfaction from your STIHL pole 
    pruner, it is important that you read and 
    understand the maintenance and safety 
    precautions, starting on page 3, before 
    using your pole pruner.
    Contact your STIHL dealer or the STIHL 
    distributor for your area if you do not 
    understand any of the instructions in this 
    Because a pole pruner is a high-speed 
    cutting tool with a very long reach some 
    special safety precautions must be 
    observed to reduce the risk of personal 
    Careless or improper use may cause 
    serious or even fatal injury.
    STIHLs philosophy is to continually 
    improve all of its products. As a result, 
    engineering changes and improve-
    ments are made from time to time. If the 
    operating characteristics or the 
    appearance of your pole pruner differ 
    from those described in this manual, 
    please contact your STIHL dealer for 
    information and assistance. 
    							2 english
    HT 70, HT 75PictogramsAll the pictograms attached to the 
    machine are shown and explained in  
    this manual.
    The operating and handling instructions 
    are supported by illustrations.Symbols in textThe individual steps or procedures 
    described in the manual may be marked 
    in different ways:
    :Step or procedure without direct 
    reference to an illustration. 
    Description of step or procedure that 
    refers directly to the illustration and 
    contains item numbers that appear in 
    the illustration.
    Loosen the screw (1) 
    Lever (2) ...In addition to the operating instructions, 
    this manual may contain paragraphs 
    that require your special attention. Such 
    paragraphs are marked with the 
    symbols described below:
    Warning where there is a risk of an 
    accident or personal injury or 
    serious damage to property.
    Warning where there is a risk of 
    damaging the machine or individual 
    Note or hint which is not essential 
    for using the machine, but may 
    improve the operator’s under-
    standing of the situation and result 
    in better use of the machine.
    Note or hint on correct procedure in 
    order to avoid damage to the 
    Equipment and featuresThis instruction manual refers to 
    several models with different 
    features. Components that are not 
    installed in all models and related 
    applications are marked thus 
    Such components are available as 
    special accessories from your 
    STIHL dealer.
    Engineering improvementsSTIHL’s philosophy is to continually 
    improve all of its products. As a result, 
    engineering changes and improvements 
    are made from time to time. If the 
    operating characteristics or the 
    appearance of your machine differ from 
    those described in this manual, please 
    contact your STIHL dealer for 
    Therefore, we cannot be responsible for 
    changes, modifications or 
    improvements not covered in this 
    Guide to Using this Manual 
    							3 HT 70, HT 75english
    The use of any pole 
    pruner may be 
    hazardous. The pole 
    pruner chain has many 
    sharp cutters. If the 
    cutters contact your flesh, 
    they will cut you, even if the chain is not 
    moving. At full throttle, the chain speed 
    can reach 68 mph (30 m/s). It is 
    important that you read, fully understand 
    and observe the following safety 
    precautions and warnings. Read the 
    owners manual and the safety 
    instructions periodically.
    All safety precautions that are generally 
    observed when working with an axe or a 
    hand saw also apply to the operation of 
    pole pruners. However, because a pole 
    pruner is a high-speed, fast-cutting 
    power tool with a very long reach, 
    special safety precautions must be 
    observed to reduce the risk of personal 
    Have your STlHL dealer show you how 
    to operate your pole pruner. Observe all 
    applicable local safety regulations, 
    standards and ordinances.
    Minors should never be allowed to use a 
    pole pruner. Bystanders, especially 
    children, and animals should not be 
    allowed in the area where a pole pruner 
    is in use. Never let the pole pruner run 
    The pole pruner user is responsible for 
    accidents or risks involving third parties 
    or their property!
    Do not lend or rent your 
    pole pruner without the 
    owners manual. Be sure 
    that anyone using your 
    pole pruner reads and 
    understands the 
    information contained in 
    this manual.
    These safety precautions and warnings 
    apply to the use of all STIHL pole 
    pruners. Different models may have 
    different parts and controls. See the 
    appropriate section of your owners 
    manual for a description of the controls 
    and function of the parts of your model 
    pole pruner.Safe use of a pole pruner involves:
    1. the operator 
    2. the pole pruner 
    3. the use of the pole pruner
    THE OPERATORPhysical Condition 
    You must be in good physical condition 
    and mental health and not under the 
    influence of any substance (drugs, 
    alcohol etc.) which might impair vision, 
    dexterity or judgment.
    Do not operate a pole pruner when you 
    are fatigued. Be alert – if you get tired 
    while operating your pole pruner, take a 
    break. Tiredness may result in loss of 
    control. Working with any pole pruner 
    can be strenuous. If you lack sufficient 
    strength to maintain control of the 
    pruner, do not use it. If you have any 
    condition that might be aggravated by 
    strenuous work, check with your doctor 
    before operating a pole pruner.
    Safety Precautions 
    							4 english
    HT 70, HT 75!
    Prolonged use of pole pruners (or other 
    machines) exposing the operator to 
    vibrations may produce whitefinger 
    disease (Raynauds phenomenon) or 
    carpal tunnel syndrome. These 
    conditions reduce the hands ability to 
    feel and regulate temperature, produce 
    numbness and burning sensations and 
    may cause nerve and circulation 
    damage and tissue necrosis.
    All factors which contribute to 
    whitefinger disease are not known, but 
    cold weather, smoking and diseases or 
    physical conditions that affect blood 
    vessels and blood transport, as well as 
    high vibration levels and long periods of 
    exposure to vibration are mentioned as 
    factors in the development of whitefinger 
    disease. In order to reduce the risk of 
    whitefinger disease and carpal tunnel 
    syndrome, please note the following::Most STIHL power tools are 
    available with an anti-vibration 
    (AV) system designed to reduce 
    the transmission of vibrations 
    created by the engine to the 
    operators hands. An AV system is 
    recommended for those persons 
    using power tools on a regular or 
    sustained basis.
    :Wear gloves and keep your hands 
    :Keep the AV system well 
    maintained. A pole pruner with 
    loose components or with damaged 
    or worn AV buffers will tend to have 
    higher vibration levels.
    :Maintain a firm grip at all times, but 
    do not squeeze the handles with 
    constant, excessive pressures, take 
    frequent breaks. 
    All the above mentioned precautions do 
    not guarantee that you will not sustain 
    whitefinger disease or carpal tunnel 
    syndrome. Therefore continual and 
    regular users should monitor closely the 
    condition of their hands and fingers. If 
    any of the above symptoms appear, 
    seek medical advice immediately.
    The ignition system of your unit 
    produces an electromagnetic field of a 
    very low intensity. This field may 
    interfere with some pacemakers. To reduce the risk of serious or fatal 
    injury, persons with pacemaker should 
    consult their physician and the 
    pacemaker manufacturer before 
    operating this tool.
    Proper Clothing
    Clothing must be sturdy 
    and snug-fitting, but allow 
    complete freedom of 
    movement. Avoid loose-
    fitting jackets, scarves, 
    neckties, jewelry, flared or 
    cuffed pants, or anything that could 
    become entangled with the pruner or 
    brush. Wear overalls or jeans with 
    reinforced cut retardant inserts.
    Wear gloves to improve 
    your grip and help protect 
    your hands when 
    handling the pole pruner 
    and saw chain. Heavy-
    duty, nonslip gloves are 
    Good footing is most 
    important in pole pruner 
    work. Wear sturdy boots 
    with nonslip soles. Steel-
    toed safety boots are 
    							5 HT 70, HT 75english
    To reduce the risk of injury 
    to your eyes never 
    operate a pole pruner 
    unless wearing goggles or 
    properly fitted safety 
    glasses with adequate top 
    and side protection complying with 
    ANSI Z 87.1.
    To reduce the risk of injury to your face, 
    STIHL recommends that you also wear 
    a face shield or face screen over your 
    goggles or safety glasses.
    Wear an approved safety hard hat to 
    reduce the risk of head injury. Pole 
    pruner noise may damage your hearing. 
    Always wear sound barriers (ear plugs 
    or ear mufflers) to reduce the risk of 
    hearing loss. Continual and regular 
    users should have their hearing checked 
    THE POLE PRUNERFor illustrations and definitions of the 
    parts of the pole pruner see the chapter 
    on Parts and Controls and 
    Never modify a pole pruner in any way. 
    Only attachments and parts supplied by 
    STIHL or expressly approved by STIHL 
    for use with the specific STIHL pole 
    pruner models are authorized. Although 
    certain unauthorized attachments are 
    useable with the STIHL powerhead, 
    their use may, in fact, be extremely 
    Use the unit only with the recommended 
    saw chain and guide bar – a longer bar 
    makes the unit difficult to control.
    THE USE OF THE UNITTransporting the pole pruner!
    Always stop the engine before putting a 
    pole pruner down or carrying it. Carrying 
    a pole pruner with the engine running is 
    extremely dangerous. Accidental 
    acceleration of the engine can cause the 
    chain to rotate.
    During operation, the powerhead muffler 
    and the material around it reach 
    extremely high temperatures. Avoid 
    touching the hot muffler – you could 
    receive serious burns!
    By hand: When carrying your pole 
    pruner by hand, the engine must be 
    stopped and the pole pruner must be in 
    the proper position. The chain guard 
    (scabbard) should be over the chain and 
    the guide bar, which should point 
    backwards. When carrying your pole 
    pruner, the bar should be behind you.
    By vehicle: When transporting in a 
    vehicle, keep chain and bar covered with 
    the chain guard. Properly secure your 
    pole pruner to prevent turnover, fuel 
    spillage and damage to the pole pruner.
    390BA000 KN 
    							6 english
    HT 70, HT 75 Preparation for the use of the pole 
    Take off the chain guard and inspect for 
    safety in operation. For assembly, follow 
    the procedure described in the chapter 
    Mounting the Bar and Chain of your 
    owners manual. 
    STIHL Oilomatic chain, guide bar and 
    sprocket must match each other in 
    gauge and pitch.!
    Proper chain tension is extremely 
    important. In order to avoid improper 
    setting, the tensioning procedure must 
    be followed as described in your 
    manual. Always make sure the hex 
    nut(s) for the sprocket cover is (are) 
    tightened securely after tensioning the 
    Never start the pole pruner with the 
    sprocket cover loose. Check chain 
    tension once more after having 
    tightened the nut(s) and thereafter at 
    regular intervals (whenever the pole 
    pruner is shut off). If the chain becomes 
    loose while cutting, shut off the engine 
    and then tighten. Never try to tighten the 
    chain while the engine is running!Fueling
    Your STIHL pole pruner uses an oil-
    gasoline mixture for fuel (see chapter
     Fuel of your owners manual).
    Gasoline is an extremely flammable fuel. 
    If spilled or ignited by a spark or other 
    ignition source, it can cause fire and 
    serious burn injury or property damage. 
    Use extreme caution when handling 
    gasoline or fuel mix. 
    To reduce the risk of fire or  
    burn injury, do not smoke 
    while using or standing 
    near the machine. 
    Combustible fuel vapor 
    may escape from the fuel 
    Dust (e.g. wood dust), vapor (e.g. oil 
    mist from the chain lubricating system) 
    and smoke containing chemical 
    substances may be produced when 
    using this machine. These substances 
    may cause serious injuries and health 
    risks such as respiratory illnesses, 
    cancer, genetic defects or hereditary 
    damage. If the risks associated with the possible 
    dust, vapor and smoke emissions are 
    not known, you should obtain the 
    relevant information from the contractor 
    or the responsible control body.
    If it is not possible to avoid considerable 
    amounts of dust, vapor or smoke being 
    generated in spite of using the proper 
    working techniques, it is recommended 
    that  the operator and bystanders wear 
    respirators approved for the substances 
    Fueling Instructions
    Fuel your pole pruner in well-ventilated 
    areas, outdoors only.
    Always shut off the engine and allow it to 
    cool before refueling. Gasoline vapor 
    pressure may build up inside the gas-
    tank of a two cycle engine depending on 
    the fuel used, the weather conditions, 
    and the venting system of the tank.  
    							7 HT 70, HT 75english
    In order to reduce the risk of burns or 
    other personal injury from escaping gas 
    vapor and fumes, remove the fuel cap 
    on the STIHL product carefully so as to 
    allow any pressure build-up in the tank 
    to release slowly. Never remove fuel 
    filler cap while engine is running.
    Select bare ground for fueling and move 
    at least 10 feet (3 m) from fueling spot 
    before starting the engine. Wipe off any 
    spilled fuel before starting your pole 
    pruner, and check for leakage.
    Check for fuel leakage while refueling 
    and during operation. If fuel or oil 
    leakage is found, do not start or run the 
    engine until leak is fixed and spilled fuel 
    has been wiped away. Take care not to 
    get fuel on your clothing. If this happens, 
    change your clothing immediately.
    Unit vibrations can cause 
    an improperly tightened 
    fuel cap to loosen or come 
    off and spill quantities of 
    In order to reduce risk of fuel spillage 
    and fire, tighten fuel cap by hand with as 
    much force as possible. Check fuel cap 
    periodically for tightness.
    Your pole pruner is a one-person unit. 
    Do not allow other persons to be near 
    the running pole pruner. Keep 
    bystanders at least 15 m (50 ft) away. 
    Start and operate your pole pruner 
    without assistance.
    For specific starting instructions, see the 
    appropriate section of the Owners 
    Manual. Proper starting methods reduce 
    the risk of injury.Place the pole pruner on firm ground or 
    other solid surface in an open area or in 
    the alternate as shown in the above 
    picture. Maintain a good balance and 
    secure footing.
    To reduce the risk of injury from loss of 
    control, be sure that the guide bar and 
    chain are clear of you and all other 
    obstructions and objects, including the 
    ground. When the engine is started, the 
    engine speed with the starting throttle 
    lock engaged will be fast enough for the 
    clutch to engage the sprocket and turn 
    the chain. Never attempt to start the pole 
    pruner when the guide bar is in a cut or 
    390BA022 KN 
    							8 english
    HT 70, HT 75 When you pull the starter grip, do not 
    wrap the starting rope around your 
    hands. Do not allow the grip to snap 
    back, but guide the starter rope slowly 
    back to permit the rope to rewind 
    properly. Failure to follow this procedure 
    may result in injury to hand or fingers 
    and may damage the starter 
    Important adjustments!
    Warning !
    To reduce the risk of personal injury from 
    loss of control or contact with the 
    running chain, do not use a pole pruner 
    with incorrect idle adjustment. At correct 
    idle speed, the chain should not rotate.
    For directions to adjust idle speed, see 
    the appropriate section of your owners 
    manual. If you cannot set the correct idle 
    speed, have your STIHL dealer check 
    your pole pruner and make proper 
    adjustments or repairs. 
    After adjusting chain tension, start the 
    pole pruner, let the engine run for a 
    while, then switch engine off and 
    recheck chain tension. Proper chain 
    tension is very important at all times.Working Conditions
    Danger! Risk of Electrocution!
    This pruner is not 
    insulated against electric 
    shock. Approaching or 
    contacting electric power 
    lines with a pruner may 
    cause death by 
    electrocution or serious bodily injury.
    Electricity can jump from one point to 
    another by means of arcing. Higher 
    voltage increases the distance electricity 
    can arc. Electricity can also move 
    through branches, especially if they are 
    wet. Maintain a clearance of at least 
    15 m (50 ft) between the pruner 
    (including any branches it is contacting) 
    and any electrical line carrying live 
    current. Before working with less 
    clearance, contact your electric utility 
    and make sure current is turned off.
    The pole pruner has a large range. In 
    order to reduce the risk of personal or 
    even fatal injury to bystanders from 
    falling objects and thrown pieces of 
    wood or in advertent contact with the 
    rotating chain of the pruner always keep 
    bystanders at least 15 m (50 ft) away 
    when the pole pruner is running.
    Operate your pole pruner only outdoors 
    in a ventilated area. 
    Your pole pruner 
    produces toxic exhaust 
    fumes as soon as the 
    combustible engine is 
    running. These gases 
    (e.g. carbon monoxide) 
    may be colorless and 
    To reduce the risk of serious or fatal 
    injury from breathing toxic fumes, never 
    run the pole pruner indoors or in poorly 
    ventilated locations.
    15m (50ft)
    15m (50ft) 
    							9 HT 70, HT 75english
    Use of this product (including sharpen-
    ing the saw chain) can generate dust, 
    mists and fumes containing chemicals 
    known to cause respiratory disease, 
    cancer, birth defects, or other 
    reproductive harm. If you are unfamiliar 
    with the risks associated with the 
    particular dust, mist or fume at issue, 
    consult your employer, governmental 
    agencies such as OSHA and NIOSH 
    and other sources on hazardous 
    materials. California and some other 
    authorities, for instance, have published 
    lists of substances known to cause 
    cancer, reproductive toxicity, etc. Control 
    dust (such as sawdust), mists (such as 
    oil mist from chain lubrication) and 
    fumes at the source where possible.
    In this regard use good work practices 
    and follow the recommendations of 
    OSHA / NIOSH and occupational and 
    trade associations. When the inhalation 
    of toxic dust, mists and fumes cannot be 
    eliminated, the operator and any 
    bystanders should always wear a 
    respirator approved by NIOSH / MSHA 
    for the type substance at issue.
    Breathing asbestos dust is dangerous 
    and can cause severe or fatal injury, 
    respiratory illness or cancer. The use 
    and disposal of asbestos containing 
    products have been strictly regulated by 
    OSHA and the Environmental Protection 
    Agency. Do not cut or disturb asbestos, 
    asbestos containing products (e.g. 
    asbestos containing drywall or other 
    construction products), or products such 
    as pipes which are wrapped or covered 
    with asbestos insulation. If you have any 
    reason to believe that you might be 
    cutting asbestos, immediately contact 
    your employer or a local OSHA 
    The muffler and other parts of the engine 
    (e.g. fins of the cylinder, spark plug) 
    become hot during operation and remain 
    hot for a while after stopping the engine. 
    To reduce risk of burns do not touch the 
    muffler and other parts while they are 
    hot. Operate the pole pruner under good 
    visibility and daylight conditions only. 
    Dont work alone. Keep within calling 
    distance of others in case help is 
    Take extreme care in wet and freezing 
    weather and in slippery conditions (rain, 
    snow, ice). Put off the work when the 
    weather is windy, stormy or rainfall is 
    Avoid stumbling on obstacles such as 
    stumps, roots or rocks and watch out for 
    holes or ditches. Be extremely cautious 
    when working on slopes or uneven 
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